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understrap/inc/bootstrap-wp-gallery.php

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<?php
//Based on Jeff Hays code and his article here: http://robido.com/wordpress/wordpress-gallery-filter-to-modify-the-html-output-of-the-default-gallery-shortcode-and-style/
// Custom filter function to modify default gallery shortcode output
function bootstrap_wp_gallery( $output, $attr ) {
// Initialize
global $post, $wp_locale;
// Gallery instance counter
static $instance = 0;
$instance++;
// Validate the author's orderby attribute
if ( isset( $attr['orderby'] ) ) {
$attr['orderby'] = sanitize_sql_orderby( $attr['orderby'] );
if ( ! $attr['orderby'] ) unset( $attr['orderby'] );
}
// Get attributes from shortcode
extract( shortcode_atts( array(
'order' => 'ASC',
'orderby' => 'menu_order ID',
'id' => $post->ID,
'itemtag' => 'div',
'icontag' => 'div',
'captiontag' => 'div',
'columns' => 3,
'size' => 'thumbnail',
'include' => '',
'exclude' => ''
), $attr ) );
// Initialize
$id = intval( $id );
$attachments = array();
if ( $order == 'RAND' ) $orderby = 'none';
if ( ! empty( $include ) ) {
// Include attribute is present
$include = preg_replace( '/[^0-9,]+/', '', $include );
$_attachments = get_posts( array( 'include' => $include, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby ) );
// Setup attachments array
foreach ( $_attachments as $key => $val ) {
$attachments[ $val->ID ] = $_attachments[ $key ];
}
} else if ( ! empty( $exclude ) ) {
// Exclude attribute is present
$exclude = preg_replace( '/[^0-9,]+/', '', $exclude );
// Setup attachments array
$attachments = get_children( array( 'post_parent' => $id, 'exclude' => $exclude, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby ) );
} else {
// Setup attachments array
$attachments = get_children( array( 'post_parent' => $id, 'post_status' => 'inherit', 'post_type' => 'attachment', 'post_mime_type' => 'image', 'order' => $order, 'orderby' => $orderby ) );
}
if ( empty( $attachments ) ) return '';
// Filter gallery differently for feeds
if ( is_feed() ) {
$output = "\n";
foreach ( $attachments as $att_id => $attachment ) $output .= wp_get_attachment_link( $att_id, $size, true ) . "\n";
return $output;
}
// Filter tags and attributes
$itemtag = tag_escape( $itemtag );
$captiontag = tag_escape( $captiontag );
$columns = intval( $columns );
$itemwidth = $columns > 0 ? floor( 12 / $columns ) : 100;
$float = is_rtl() ? 'right' : 'left';
$selector = "gallery-{$instance}";
// Filter gallery CSS
$output = apply_filters( 'gallery_style', "
<div id='$selector' class='gallery galleryid-{$id} row'>"
);
// Iterate through the attachments in this gallery instance
$i = 0;
foreach ( $attachments as $id => $attachment ) {
// Attachment link
$link = isset( $attr['link'] ) && 'file' == $attr['link'] ? wp_get_attachment_link( $id, $size, false, false ) : wp_get_attachment_link( $id, $size, true, false );
// Start itemtag
$output .= "<{$itemtag} class='gallery-item col-md-{$itemwidth}'>";
// icontag
$output .= "
<{$icontag} class='gallery-icon'>
$link
</{$icontag}>";
if ( $captiontag && trim( $attachment->post_excerpt ) ) {
// captiontag
$output .= "
<{$captiontag} class='gallery-caption'>
" . wptexturize($attachment->post_excerpt) . "
</{$captiontag}>";
}
// End itemtag
$output .= "</{$itemtag}>";
// Line breaks by columns set
if($columns > 0 && ++$i % $columns == 0) $output .= '<br style="clear: both">';
}
// End gallery output
$output .= "
<br style='clear: both;'>
</div>\n";
return $output;
}
// Apply filter to default gallery shortcode
add_filter( 'post_gallery', 'bootstrap_wp_gallery', 10, 2 );